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Watch Joe Jonas and Nick Jonas perform together at the Philly's Fourth of July Jam/Wawa Welcome To America event in Philadelphia.

Jonas Brothers reunion! Well... except for Kevin, of course!

Still, we'll take as much Jonas Bros as we can get.

Nick tweeted: "I got up on stage with Joe tonight to sing a few Jonas Brothers songs. #onlyappropriateinthecityofbrotherlyloved"

So awesome!

Nick tweeted this photo of him and Joe watching the fireworks, writing, "One of my favorite independence days ever."

Joe also tweeted the pic, writing, "Happy 4th! With my bro @nickjonas having a great time"

Too bad Kevin was busy that day co-hosting Live! With Kelly, then heading off on vacation with his wife, Danielle.

Joe said to the crowd, "We have any Jonas Brothers fans out there?"

You can guess the reaction...

Joe and Nick sang When You Look Me in the Eyes (Nick entered the stage after Joe said, "Why don't you say 'what's up' to my brother Nick Jonas, everybody." They followed it up with Hello Beautiful and Burnin' Up.